I'll take on the DeMarcus/free throw question.
If his shooting motion shows that he is getting his arm up high enough, ( I watch his right elbow for being at least up to the height of his chin at release) he will make probably 90% of his shots. He's dead on line-target that often. The great majority of his misses are distance category. (too long or too short)
If he weighs the same as a duck....then he's made of wood.
And therefore......
But seriously, it's not just Nelson. The whole team needs to be sharp at the line, and not allow any scoring chance to pass them by.